Re: variable lenght strings

[Jean-Pierre Rosen <rosen@adalog.fr>]

Randy Brukardt a écrit :

> My opinion is that GNAT is wrong in that case. A.10(7) makes it quite clear
> that you can't have a file terminator without a line and page terminator in
> front of it.
More precisely: a file that doesn't end with a line/page terminator is 
improperly formatted.
> 
> I vaguely recall having argued this with Robert Dewar, and I think that they
> had a different interpretation, based on the idea that a file with a missing
> CR/LF is incorrect for use with Text_IO. I hope I misremember that, because
> it is stupid (even if it is logically correct) as it essentially says that
> you can't read outside generated text files with Text_IO (you can't know
> whether the file has CR/LFs as required).
> 
> But I can understand why they wouldn't want to do this properly, because it
> is a pain to get right, and it saps the performance of Text_IO (since you
> have the be prepared to check for implied characters for each one you read).
No, it's simpler than that.

In all my programs, I simply never check for End_Of_File, I catch 
End_Error instead. It is simpler in other cases too: if you read 
numbers, and the file is terminated with blank lines, you can get 
End_Error even when End_Of_File is false.

-- 
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            J-P. Rosen (rosen@adalog.fr)
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